Validbot

inspired by http://reefpoints.dockyard.com/ruby/2013/05/09/context-validations.html

attempting to provide a solution to different validations for controller methods depending on the context and also applying those validations to non-active_record objects

Installation

Add this line to your application's Gemfile:

gem 'validbot'

And then execute:

$ bundle

Or install it yourself as:

$ gem install validbot

Usage

Validations are applied to the object that is passed to the validate method, the validations in the block passed are applied when valid? is called on the object.

Basic controller example:

  class AwesomeController < ApplicationController

    def create
      @awesome = ::Awesome.new(params)
      validate_create(@aweome)

      if @awesome.valid?
        render :show
      else
        render :error
      end
    end

    def update
      @awesome = ::Awesome.find(params[:id])
      validate_update(@aweome)

      if @awesome.valid?
        render :show
      else
        render :error
      end
    end

  private

    def validate_create(awesome_object)
      Validbot.validate(awesome_object) do
        validates :name, :presence => true # name must be present on create
      end
    end

    def validate_update(awesome_object)
      Validbot.validate(awesome_object) do
        validate :has_not_been_updated_recently?

        def has_not_been_updated_recently?
          if self.updated_at && self.updated_at > 15.minutes.ago
            self.errors.add(:updated_at, 'can only update every 15 minutes')
          end
        end
      end
    end
  end

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request